<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>index.jsp</title>
</head>
<body>
<%
String loginname = request.getParameter("lg");
%>
<%=loginname %>
<% if(true) {%>
	成功~
<% }%>

<br>
loginname = ${LOGINNAME }	<!-- 为了区分所以分大小写 -->
</body>
</html>